a) Many drugs act to increase the survival of infants who would normally be kill

Question

a) Many drugs act to increase the survival of infants who would normally be killed by childhood diseases such as polio, measles, etc. If all other factors are held constant, what general effects should these drugs have on the growth rate (r) and size (N) of human populations?

b) Many other drugs target diseases of the elderly and reduce the mortality rate of people in their 60s and above from diseases such as Parkinson’s, Alzheimer’s, etc. If all other factors are held constant, what general effects should these drugs have on the growth rate (r) and size (N) of human populations?

c) Oral contraceptives are increasingly available to women throughout the developing world. If all other factors are held constant, what general effects should these drugs have on the growth rates (r) and sizes (N) of human populations?

Explanation / Answer

A) If all the factors are held constant then Growth Rate (r) would Increase and Human Population size (N) would also Increase
B) Beacuase of drugs targetting dieseases in 60s. the effect on Growth Rate (r) can't be determined as it depends on birth rate as well however human population size (N) would increase because of that.

C)Due to more contraceptives, Growth rate (r) would reduce. However we can say the effect on the human population size (N) cause it depends on both birth rate and death rate.

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